Update to Chromium revision cb947c01 (#352221)

- Implement CefRequestHandler::OnBeforeBrowse using NavigationThrottle
  instead of ResourceThrottle (see http://crbug.com/537634). The CefRequest
  object passed to OnBeforeBrowse will no longer have an associated request
  identifier.
- Mac: Remove additional helper apps which are no longer required (see
  http://crbug.com/520680)
- Remove the UR_FLAG_REPORT_RAW_HEADERS flag which is no longer supported (see
  http://crbug.com/517114)
- Remove the CefBrowserSettings.java parameter. Java is an NPAPI plugin and
  NPAPI plugins are no longer supported (see http://crbug.com/470301#c11)
- Add CefFormatUrlForSecurityDisplay function in cef_parser.h
- Fix crash when passing `--disable-extensions` command-line flag (issue #1721)
- Linux: Fix NSS handler loading (issue #1727)

libcef/browser/devtools_frontend.cc

@@ -272,6 +272,9 @@ void CefDevToolsFrontend::HandleMessageFromDevToolsFrontend(
     if (!params->GetString(0, &name))
       return;
     preferences_.RemoveWithoutPathExpansion(name, nullptr);
+  } else if (method == "requestFileSystems") {
+    web_contents()->GetMainFrame()->ExecuteJavaScriptForTests(
+        base::ASCIIToUTF16("DevToolsAPI.fileSystemsLoaded([]);"));
   } else {
     return;
   }